I feel like something about wireless internet makes it incompatible with crpg. I can play any other game without getting insane quadruple digit ping, I can stream movies in HD. But joining a CRPG server makes my internet go to shit. I used to play on a wired connection (same ISP) and never had the problem.
I even bought a wireless network extender. It's 20 feet from my router. My computer is 20 feet from the extender. I still get crazy ping spikes only with crpg, but they are 100-300 ping instead of 1,000+ ping.